Commit | Line | Data |
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b8695a8f JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2007-2008, Intel Corporation | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
17 | #include <net/mac80211.h> | |
18 | #include "ieee80211_i.h" | |
24487981 | 19 | #include "driver-ops.h" |
b8695a8f | 20 | |
849b7967 JB |
21 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
22 | u16 initiator, u16 reason) | |
b8695a8f | 23 | { |
d75636ef | 24 | struct ieee80211_local *local = sta->local; |
d75636ef | 25 | int i; |
b8695a8f JB |
26 | |
27 | /* check if TID is in operational state */ | |
28 | spin_lock_bh(&sta->lock); | |
d75636ef | 29 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) { |
b8695a8f | 30 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
31 | return; |
32 | } | |
d75636ef | 33 | |
b8695a8f JB |
34 | sta->ampdu_mlme.tid_state_rx[tid] = |
35 | HT_AGG_STATE_REQ_STOP_BA_MSK | | |
36 | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); | |
37 | spin_unlock_bh(&sta->lock); | |
38 | ||
b8695a8f JB |
39 | #ifdef CONFIG_MAC80211_HT_DEBUG |
40 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", | |
d75636ef | 41 | sta->sta.addr, tid); |
b8695a8f JB |
42 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
43 | ||
24487981 JB |
44 | if (drv_ampdu_action(local, IEEE80211_AMPDU_RX_STOP, |
45 | &sta->sta, tid, NULL)) | |
b8695a8f JB |
46 | printk(KERN_DEBUG "HW problem - can not stop rx " |
47 | "aggregation for tid %d\n", tid); | |
48 | ||
49 | /* shutdown timer has not expired */ | |
50 | if (initiator != WLAN_BACK_TIMER) | |
51 | del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
52 | ||
53 | /* check if this is a self generated aggregation halt */ | |
54 | if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) | |
d75636ef JB |
55 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
56 | tid, 0, reason); | |
b8695a8f JB |
57 | |
58 | /* free the reordering buffer */ | |
59 | for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { | |
60 | if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { | |
61 | /* release the reordered frames */ | |
62 | dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); | |
63 | sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; | |
64 | sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; | |
65 | } | |
66 | } | |
55687e38 JB |
67 | |
68 | spin_lock_bh(&sta->lock); | |
b8695a8f JB |
69 | /* free resources */ |
70 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); | |
4d050f1d | 71 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time); |
55687e38 JB |
72 | |
73 | if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { | |
74 | kfree(sta->ampdu_mlme.tid_rx[tid]); | |
75 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
76 | } | |
77 | ||
b8695a8f | 78 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; |
55687e38 | 79 | spin_unlock_bh(&sta->lock); |
d75636ef JB |
80 | } |
81 | ||
82 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, | |
83 | u16 initiator, u16 reason) | |
84 | { | |
85 | struct ieee80211_local *local = sdata->local; | |
86 | struct sta_info *sta; | |
87 | ||
88 | /* stop HW Rx aggregation. ampdu_action existence | |
89 | * already verified in session init so we add the BUG_ON */ | |
90 | BUG_ON(!local->ops->ampdu_action); | |
91 | ||
92 | rcu_read_lock(); | |
93 | ||
94 | sta = sta_info_get(local, ra); | |
95 | if (!sta) { | |
96 | rcu_read_unlock(); | |
97 | return; | |
98 | } | |
99 | ||
849b7967 | 100 | __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); |
b8695a8f JB |
101 | |
102 | rcu_read_unlock(); | |
103 | } | |
104 | ||
105 | /* | |
106 | * After accepting the AddBA Request we activated a timer, | |
107 | * resetting it after each frame that arrives from the originator. | |
108 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. | |
109 | */ | |
110 | static void sta_rx_agg_session_timer_expired(unsigned long data) | |
111 | { | |
112 | /* not an elegant detour, but there is no choice as the timer passes | |
113 | * only one argument, and various sta_info are needed here, so init | |
114 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
115 | * array gives the sta through container_of */ | |
116 | u8 *ptid = (u8 *)data; | |
117 | u8 *timer_to_id = ptid - *ptid; | |
118 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
119 | timer_to_tid[0]); | |
120 | ||
121 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
122 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); | |
123 | #endif | |
124 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
125 | (u16)*ptid, WLAN_BACK_TIMER, | |
126 | WLAN_REASON_QSTA_TIMEOUT); | |
127 | } | |
128 | ||
129 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, | |
130 | u8 dialog_token, u16 status, u16 policy, | |
131 | u16 buf_size, u16 timeout) | |
132 | { | |
b8695a8f JB |
133 | struct ieee80211_local *local = sdata->local; |
134 | struct sk_buff *skb; | |
135 | struct ieee80211_mgmt *mgmt; | |
136 | u16 capab; | |
137 | ||
138 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
139 | ||
140 | if (!skb) { | |
141 | printk(KERN_DEBUG "%s: failed to allocate buffer " | |
142 | "for addba resp frame\n", sdata->dev->name); | |
143 | return; | |
144 | } | |
145 | ||
146 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
147 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
148 | memset(mgmt, 0, 24); | |
149 | memcpy(mgmt->da, da, ETH_ALEN); | |
150 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
151 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
152 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f | 153 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
154 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
155 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
156 | ||
b8695a8f JB |
157 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
158 | IEEE80211_STYPE_ACTION); | |
159 | ||
160 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); | |
161 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
162 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; | |
163 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; | |
164 | ||
165 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ | |
166 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
167 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ | |
168 | ||
169 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); | |
170 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); | |
171 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); | |
172 | ||
173 | ieee80211_tx_skb(sdata, skb, 1); | |
174 | } | |
175 | ||
176 | void ieee80211_process_addba_request(struct ieee80211_local *local, | |
177 | struct sta_info *sta, | |
178 | struct ieee80211_mgmt *mgmt, | |
179 | size_t len) | |
180 | { | |
181 | struct ieee80211_hw *hw = &local->hw; | |
182 | struct ieee80211_conf *conf = &hw->conf; | |
183 | struct tid_ampdu_rx *tid_agg_rx; | |
184 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; | |
185 | u8 dialog_token; | |
186 | int ret = -EOPNOTSUPP; | |
187 | ||
188 | /* extract session parameters from addba request frame */ | |
189 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; | |
190 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); | |
191 | start_seq_num = | |
192 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; | |
193 | ||
194 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); | |
195 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; | |
196 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
197 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; | |
198 | ||
199 | status = WLAN_STATUS_REQUEST_DECLINED; | |
200 | ||
722f069a S |
201 | if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { |
202 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
203 | printk(KERN_DEBUG "Suspend in progress. " | |
204 | "Denying ADDBA request\n"); | |
205 | #endif | |
206 | goto end_no_lock; | |
207 | } | |
208 | ||
b8695a8f JB |
209 | /* sanity check for incoming parameters: |
210 | * check if configuration can support the BA policy | |
211 | * and if buffer size does not exceeds max value */ | |
212 | /* XXX: check own ht delayed BA capability?? */ | |
213 | if (((ba_policy != 1) | |
214 | && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) | |
215 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { | |
216 | status = WLAN_STATUS_INVALID_QOS_PARAM; | |
217 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
218 | if (net_ratelimit()) | |
219 | printk(KERN_DEBUG "AddBA Req with bad params from " | |
220 | "%pM on tid %u. policy %d, buffer size %d\n", | |
221 | mgmt->sa, tid, ba_policy, | |
222 | buf_size); | |
223 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
224 | goto end_no_lock; | |
225 | } | |
226 | /* determine default buffer size */ | |
227 | if (buf_size == 0) { | |
228 | struct ieee80211_supported_band *sband; | |
229 | ||
230 | sband = local->hw.wiphy->bands[conf->channel->band]; | |
231 | buf_size = IEEE80211_MIN_AMPDU_BUF; | |
232 | buf_size = buf_size << sband->ht_cap.ampdu_factor; | |
233 | } | |
234 | ||
235 | ||
236 | /* examine state machine */ | |
237 | spin_lock_bh(&sta->lock); | |
238 | ||
239 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { | |
240 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
241 | if (net_ratelimit()) | |
242 | printk(KERN_DEBUG "unexpected AddBA Req from " | |
243 | "%pM on tid %u\n", | |
244 | mgmt->sa, tid); | |
245 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
246 | goto end; | |
247 | } | |
248 | ||
249 | /* prepare A-MPDU MLME for Rx aggregation */ | |
250 | sta->ampdu_mlme.tid_rx[tid] = | |
251 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); | |
252 | if (!sta->ampdu_mlme.tid_rx[tid]) { | |
253 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
254 | if (net_ratelimit()) | |
255 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", | |
256 | tid); | |
257 | #endif | |
258 | goto end; | |
259 | } | |
260 | /* rx timer */ | |
261 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = | |
262 | sta_rx_agg_session_timer_expired; | |
263 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = | |
264 | (unsigned long)&sta->timer_to_tid[tid]; | |
265 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
266 | ||
267 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
268 | ||
269 | /* prepare reordering buffer */ | |
270 | tid_agg_rx->reorder_buf = | |
271 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); | |
4d050f1d JM |
272 | tid_agg_rx->reorder_time = |
273 | kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC); | |
274 | if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { | |
b8695a8f JB |
275 | #ifdef CONFIG_MAC80211_HT_DEBUG |
276 | if (net_ratelimit()) | |
277 | printk(KERN_ERR "can not allocate reordering buffer " | |
278 | "to tid %d\n", tid); | |
279 | #endif | |
4d050f1d JM |
280 | kfree(tid_agg_rx->reorder_buf); |
281 | kfree(tid_agg_rx->reorder_time); | |
b8695a8f | 282 | kfree(sta->ampdu_mlme.tid_rx[tid]); |
4d050f1d | 283 | sta->ampdu_mlme.tid_rx[tid] = NULL; |
b8695a8f JB |
284 | goto end; |
285 | } | |
286 | ||
24487981 JB |
287 | ret = drv_ampdu_action(local, IEEE80211_AMPDU_RX_START, |
288 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
289 | #ifdef CONFIG_MAC80211_HT_DEBUG |
290 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); | |
291 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
292 | ||
293 | if (ret) { | |
294 | kfree(tid_agg_rx->reorder_buf); | |
295 | kfree(tid_agg_rx); | |
296 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
297 | goto end; | |
298 | } | |
299 | ||
300 | /* change state and send addba resp */ | |
301 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; | |
302 | tid_agg_rx->dialog_token = dialog_token; | |
303 | tid_agg_rx->ssn = start_seq_num; | |
304 | tid_agg_rx->head_seq_num = start_seq_num; | |
305 | tid_agg_rx->buf_size = buf_size; | |
306 | tid_agg_rx->timeout = timeout; | |
307 | tid_agg_rx->stored_mpdu_num = 0; | |
308 | status = WLAN_STATUS_SUCCESS; | |
309 | end: | |
310 | spin_unlock_bh(&sta->lock); | |
311 | ||
312 | end_no_lock: | |
313 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, | |
314 | dialog_token, status, 1, buf_size, timeout); | |
315 | } |